Is a Mature Hairline Classified as Norwood 2?

I’ve been told I have a mature hairline, and that I have nothing to worry about regarding hair loss, which is a great relief. However, I have a couple of questions;

First off, is a mature hairline classed as a Norwood 2? Because from comments on various forums, they say I have a Norwood 1 hairline, but it’s matured, and when I cross reference my hairline with the scale, it fits in more with a Norwood 1.

Secondly, is it possible for someone to develop a mature hairline and then that’s their hairline for the rest of their life? What age does maturing kick in? I’m 21.

I generally don’t like to classify patients in Norwood class 1 or 2, because it isn’t really considered hair loss. This is not a surgical issue, at least in our hands. I suppose a mature hairline can look like a Norwood 1 or 2. If you feel the absolute need to classify yourself in a certain Norwood pattern, go for it! Doctors usually use the Norwood classification not to label you, but to predict and follow your hair loss pattern over time, particularly in planning surgery.

Some men will have a mature hairline for life and no loss beyond that. There’s no specific age you can look to as a deadline for this to occur.